Water, a square dish pan of warm water, some paper towels, and time. All these combined to clean the thinset concrete haze off the floor in the sun room.
Still lots of things to do to finish this room, but none of them will affect the usefulness now that we can walk around out there without tracking cement dust throughout the rest of the house when we walk to and fro.
Tomorrow we are taking a break from house remodeling, and going on a short drive up into the mountains, to see what new species of birds are singing. There should be Winter Wrens, and a couple of thrush species adding their magic sounds to the air.